Hello there Harrison,
Welcome to planDisney and thanks so much for your question for a galaxy far, far away.
I'm happy to share that it is typically allowed to wear jedi robes and tunics when visiting the Happiest Place on Earth. Since these are also available for purchase in the parks, they're generally allowed to be worn.
Since I don't exactly what yours looks like, just make sure to keep in mind the
general costume guidelines. Additionally, make sure you're not wearing any kind of mask that would cover your face. That's not only against the park rules, but I also heard Darth Vader doesn't like it when others try to copy his signature look.
Lastly, as with any form of longer clothing, make sure it doesn't drag along the ground and keep an eye on it when entering and exiting attractions so it doesn't get stuck.
Speaking of
Darth Vader, did you see that you can now cross paths with him, Luke Skywalker, Han Solo, and Princess Leia around Galaxy's Edge? Additionally, there are new experiences in
Millennium Falcon: Smugglers Run - you can now help the Mandalorian and Grogu on one of their upcoming missions.
Thanks again for your question, Harrison. I hope you have a fantastic time on your upcoming visit to the Disneyland Resort.
May the Force Be With You,
Greg